Class Reptilia Linnaeus, 1758 - reptiles Subclass Archosauria Cope, 1869 see Division Archosauria Cope, 1869 Order †Ornithischia Seeley, 1887 Suborder †Stegosauria Marsh, 1877 see Infraorder Stegosauria Marsh, 1877 Family †Stegosauridae Marsh, 1880